/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

#include "../Application/jucer_Headers.h"
#include "jucer_GeneratedCode.h"
#include "jucer_JucerDocument.h"

//==============================================================================
GeneratedCode::GeneratedCode (const JucerDocument* const doc)
    : document (doc), suffix (0)
{
}

GeneratedCode::~GeneratedCode()
{
}

int GeneratedCode::getUniqueSuffix()
{
    return ++suffix;
}

//==============================================================================
String& GeneratedCode::getCallbackCode (const String& requiredParentClass,
                                        const String& returnType,
                                        const String& prototype,
                                        const bool hasPrePostUserSections)
{
    String parentClass (requiredParentClass);
    if (parentClass.isNotEmpty()
         && ! (parentClass.startsWith ("public ")
                || parentClass.startsWith ("private ")
                || parentClass.startsWith ("protected ")))
    {
        parentClass = "public " + parentClass;
    }

    for (int i = callbacks.size(); --i >= 0;)
    {
        CallbackMethod* const cm = callbacks.getUnchecked (i);

        if (cm->requiredParentClass == parentClass
             && cm->returnType == returnType
             && cm->prototype == prototype)
            return cm->content;
    }

    CallbackMethod* const cm = new CallbackMethod();
    callbacks.add (cm);

    cm->requiredParentClass = parentClass;
    cm->returnType = returnType;
    cm->prototype = prototype;
    cm->hasPrePostUserSections = hasPrePostUserSections;
    return cm->content;
}

void GeneratedCode::removeCallback (const String& returnType, const String& prototype)
{
    for (int i = callbacks.size(); --i >= 0;)
    {
        CallbackMethod* const cm = callbacks.getUnchecked (i);

        if (cm->returnType == returnType && cm->prototype == prototype)
            callbacks.remove (i);
    }
}

void GeneratedCode::addImageResourceLoader (const String& imageMemberName, const String& resourceName)
{
    privateMemberDeclarations
        << "juce::Image " << imageMemberName << ";\n";

    if (resourceName.isNotEmpty())
        constructorCode << imageMemberName << " = juce::ImageCache::getFromMemory ("
                        << resourceName << ", " << resourceName << "Size);\n";
}

StringArray GeneratedCode::getExtraParentClasses() const
{
    StringArray s;

    for (int i = 0; i < callbacks.size(); ++i)
    {
        CallbackMethod* const cm = callbacks.getUnchecked (i);
        s.add (cm->requiredParentClass);
    }

    return s;
}

String GeneratedCode::getCallbackDeclarations() const
{
    String s;

    for (int i = 0; i < callbacks.size(); ++i)
    {
        CallbackMethod* const cm = callbacks.getUnchecked (i);

        s << cm->returnType << " " << cm->prototype << " override;\n";
    }

    return s;
}

String GeneratedCode::getCallbackDefinitions() const
{
    String s;

    for (int i = 0; i < callbacks.size(); ++i)
    {
        CallbackMethod* const cm = callbacks.getUnchecked (i);

        const String userCodeBlockName ("User"
            + build_tools::makeValidIdentifier (cm->prototype.upToFirstOccurrenceOf ("(", false, false),
                                                true, true, false).trim());

        if (userCodeBlockName.isNotEmpty() && cm->hasPrePostUserSections)
        {
            s << cm->returnType << " " << className << "::" << cm->prototype
              << "\n{\n    //[" << userCodeBlockName << "_Pre]\n    //[/" << userCodeBlockName
              << "_Pre]\n\n    "
              << CodeHelpers::indent (cm->content.trim(), 4, false)
              << "\n\n    //[" << userCodeBlockName << "_Post]\n    //[/" << userCodeBlockName
              << "_Post]\n}\n\n";
        }
        else
        {
            s << cm->returnType << " " << className << "::" << cm->prototype
              << "\n{\n    "
              << CodeHelpers::indent (cm->content.trim(), 4, false)
              << "\n}\n\n";
        }
    }

    return s;
}

//==============================================================================
String GeneratedCode::getClassDeclaration() const
{
    StringArray parentClassLines;
    parentClassLines.addTokens (parentClasses, ",", StringRef());
    parentClassLines.addArray (getExtraParentClasses());

    parentClassLines = getCleanedStringArray (parentClassLines);

    if (parentClassLines.contains ("public juce::Button", false))
        parentClassLines.removeString ("public juce::Component", false);

    String r ("class ");
    r << className << "  : ";

    r += parentClassLines.joinIntoString (",\n" + String::repeatedString (" ", r.length()));

    return r;
}

String GeneratedCode::getInitialiserList() const
{
    StringArray inits (initialisers);

    if (parentClassInitialiser.isNotEmpty())
        inits.insert (0, parentClassInitialiser);

    inits = getCleanedStringArray (inits);

    String s;

    if (inits.size() == 0)
        return s;

    s << "    : ";

    for (int i = 0; i < inits.size(); ++i)
    {
        String init (inits[i]);

        while (init.endsWithChar (','))
            init = init.dropLastCharacters (1);

        s << init;

        if (i < inits.size() - 1)
            s << ",\n      ";
        else
            s << "\n";
    }

    return s;
}

static String getIncludeFileCode (const Array<File>& files, const File& targetFile)
{
    String s;

    for (int i = 0; i < files.size(); ++i)
        s << CodeHelpers::createIncludeStatement (files.getReference (i), targetFile) << newLine;

    return s;
}

bool GeneratedCode::shouldUseTransMacro() const noexcept
{
    return document->shouldUseTransMacro();
}

//==============================================================================
static void replaceTemplate (String& text, const String& itemName, const String& value)
{
    for (;;)
    {
        const int index = text.indexOf ("%%" + itemName + "%%");

        if (index < 0)
            break;

        int indentLevel = 0;

        for (int i = index; --i >= 0;)
        {
            if (text[i] == '\n')
                break;

            ++indentLevel;
        }

        text = text.replaceSection (index, itemName.length() + 4,
                                    CodeHelpers::indent (value, indentLevel, false));
    }
}

//==============================================================================
static bool getUserSection (const StringArray& lines, const String& tag, StringArray& resultLines)
{
    const int start = indexOfLineStartingWith (lines, "//[" + tag + "]", 0);

    if (start < 0)
        return false;

    const int end = indexOfLineStartingWith (lines, "//[/" + tag + "]", start + 1);

    for (int i = start + 1; i < end; ++i)
        resultLines.add (lines [i]);

    return true;
}

static void copyAcrossUserSections (String& dest, const String& src)
{
    StringArray srcLines, dstLines;
    srcLines.addLines (src);
    dstLines.addLines (dest);

    for (int i = 0; i < dstLines.size(); ++i)
    {
        if (dstLines[i].trimStart().startsWith ("//["))
        {
            String tag (dstLines[i].trimStart().substring (3));
            tag = tag.upToFirstOccurrenceOf ("]", false, false);

            jassert (! tag.startsWithChar ('/'));

            if (! tag.startsWithChar ('/'))
            {
                const int endLine = indexOfLineStartingWith (dstLines,
                                                             "//[/" + tag + "]",
                                                             i + 1);

                if (endLine > i)
                {
                    StringArray sourceLines;

                    if (tag != "UserPaintCustomArguments" && getUserSection (srcLines, tag, sourceLines))
                    {
                        for (int j = endLine - i; --j > 0;)
                            dstLines.remove (i + 1);

                        for (int j = 0; j < sourceLines.size(); ++j)
                            dstLines.insert (++i, sourceLines [j].trimEnd());

                        ++i;
                    }
                    else
                    {
                        i = endLine;
                    }
                }
            }
        }

        dstLines.set (i, dstLines[i].trimEnd());
    }

    dest = dstLines.joinIntoString ("\n") + "\n";
}

//==============================================================================
void GeneratedCode::applyToCode (String& code, const File& targetFile, const String& oldFileWithUserData) const
{
    replaceTemplate (code, "version", JUCEApplicationBase::getInstance()->getApplicationVersion());
    replaceTemplate (code, "creationTime", Time::getCurrentTime().toString (true, true, true));

    replaceTemplate (code, "class_name", className);
    replaceTemplate (code, "constructor_params", constructorParams);
    replaceTemplate (code, "initialisers", getInitialiserList());

    replaceTemplate (code, "class_declaration", getClassDeclaration());
    replaceTemplate (code, "private_member_declarations", privateMemberDeclarations);
    replaceTemplate (code, "public_member_declarations", getCallbackDeclarations() + newLine + publicMemberDeclarations);

    replaceTemplate (code, "method_definitions", getCallbackDefinitions());

    replaceTemplate (code, "include_juce", CodeHelpers::createIncludePathIncludeStatement (Project::getJuceSourceHFilename()));

    replaceTemplate (code, "include_files_h", getIncludeFileCode (includeFilesH, targetFile));
    replaceTemplate (code, "include_files_cpp", getIncludeFileCode (includeFilesCPP, targetFile));

    replaceTemplate (code, "constructor", constructorCode);
    replaceTemplate (code, "destructor", destructorCode);

    replaceTemplate (code, "metadata", jucerMetadata);
    replaceTemplate (code, "static_member_definitions", staticMemberDefinitions);

    copyAcrossUserSections (code, oldFileWithUserData);
}
